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osteopetrosis os·te·o·pe·tro·sis (ŏs'tē-ō-pě-trō'sĭs)
An inherited disorder in which bone and cartilage, especially in long bones, becomes dense and hardened to an extent that marrow is obliterated, and anemia, spleen and liver enlargement, blindness, and progressive deafness occur; it begins in infancy and sometimes results in early death. Also called Albers-Schönberg disease, marble bone disease, marble bones.